CN108192974B - Application of long-chain non-coding RNA LINC00842 as biomarker in preparation of lung adenocarcinoma prognosis detection preparation - Google Patents
Application of long-chain non-coding RNA LINC00842 as biomarker in preparation of lung adenocarcinoma prognosis detection preparation Download PDFInfo
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Abstract
The invention discloses application of a long-chain non-coding RNA LINC00842 as a biomarker in preparation of a lung adenocarcinoma prognosis detection preparation. The expression level of the long-chain non-coding RNA LINC00842 in a lung adenocarcinoma patient can be detected, a powerful molecular biological basis is provided for prognosis prediction of the lung adenocarcinoma patient, and the method has profound clinical significance and popularization.
Description
Technical Field
The invention belongs to the field of tumor molecular biology, and particularly relates to application of a long-chain non-coding RNA LINC00842 as a biomarker in preparation of a lung adenocarcinoma prognosis detection reagent.
Background
In recent years, the incidence of lung cancer has become higher and higher, and according to the statistics of the world cancer research foundation, newly diagnosed lung cancer cases account for 12.5% of the total number of cancers every year worldwide. Because 100 million people are killed each year in the world, lung cancer is the first mortality rate of various cancers in China for continuous years. Lung cancer is largely classified into small cell lung cancer and non-small cell lung cancer according to histological type, with lung adenocarcinoma being the most common type of non-small cell lung cancer. Although the survival of lung adenocarcinoma is improved with the advancement of medical technology, especially the application of targeted drugs, its 5-year survival rate is still very low. Lung adenocarcinoma mostly originates from small bronchus and is peripheral lung cancer, so early clinical symptoms are light, but lung adenocarcinoma cells have strong proliferation and metastasis capacity, and blood circulation metastasis occurs in partial early stage, so that most patients are in middle and late stages when being diagnosed, and the lung adenocarcinoma is the main reason for low survival rate and poor prognosis. Therefore, improving the diagnosis and prognosis of lung adenocarcinoma is a major means to reduce its mortality. At present, there is no reference standard and no specific index for prognosis determination of patients with lung adenocarcinoma, and the need for prognosis determination of patients with lung adenocarcinoma is far from being met. Therefore, determining the prognosis of patients with lung adenocarcinoma in order to select the optimal treatment scheme and significantly improve the survival rate of patients becomes an important issue to be solved in the field of thoracic surgery.
Long non-coding RNAs are RNA molecules that are more than 200 nucleotide residues in length, are transcribed by RNA polymerase II, and cannot encode proteins. Initial studies thought it to be "noise" of the transcriptome, but life sciences over the last decade found that they are involved in multiple biological regulatory processes. Studies have shown that long non-coding RNAs can be widely involved in genome regulation, and are closely linked to many diseases including tumors. In recent years, long-chain non-coding RNA has been paid more attention by researchers as an important regulatory molecule and its application value in clinical diagnosis, chemotherapy sensitivity, prognosis evaluation and the like. There are studies showing that HOTAIR expression is increased in both primary breast tumors and metastases, and the level of HOTAIR expression in primary tumors can be used to effectively predict cancer metastasis and death. The long-chain non-coding RNA PCA3 is highly overexpressed in prostate cancer, and the long-chain non-coding RNA is found in urine and is quite convenient for clinical detection. The long-chain non-coding RNA LALR1 accelerates the cell cycle process and promotes the hepatocyte proliferation by activating Wnt/beta-catenin signals. The drug target intervention long-chain non-coding RNA LALR1 is adopted to induce liver regeneration, and the drug target intervention long-chain non-coding RNA LALR1 is possibly beneficial to liver failure and liver transplantation treatment. It follows that long non-coding RNAs have great potential as molecular markers for diagnosis, prognosis and therapy.
At present, there is no reference standard and no specific index for prognosis determination of patients with lung adenocarcinoma, and the need for prognosis determination of patients with lung adenocarcinoma is far from being met. Therefore, determining the prognosis of patients with lung adenocarcinoma in order to select the optimal treatment scheme and significantly improve the survival rate of patients becomes an important issue to be solved in the field of thoracic surgery.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides application of a long-chain non-coding RNA LINC00842 as a biomarker in preparation of a lung adenocarcinoma prognosis detection preparation.
Long non-coding RNA LINC00842 mapped to chromosome 10q11.22, GeneBank accession no: NR-033957.2 (the sequence of the long-chain non-coding RNA LINC00842 is shown in SEQ NO: 1). In the early research work, the inventor extracts RNA from lung adenocarcinoma tissues, carries out real-time fluorescence quantitative PCR analysis on the expression of the long-chain non-coding RNA LINC00842 after reverse transcription, and finds that: the expression of the long-chain non-coding RNA LINC00842 is down-regulated in lung adenocarcinoma tissues, and is remarkably different from the expression in normal human lung tissues (P <0.0001) (figure 1). And the prognosis of lung adenocarcinoma patients with different expression levels of the long-chain non-coding RNA LINC00842 is obviously different, Kaplan-Meier survival analysis shows that the survival rate of lung adenocarcinoma patients with low expression of the long-chain non-coding RNA LINC00842 is obviously lower than that of patients with high expression (P0.0467) (figure 2), ratio risk model prognosis analysis shows that the risk rate of the long-chain non-coding RNA LINC00842 is more than 1(HR 2.7160), which indicates that patients with high expression prognosis of patients with low expression of the long-chain non-coding RNA LINC00842 have poor prognosis, and the low expression of the long-chain non-coding RNA LINC00842 is an independent risk factor for predicting the prognosis risk of lung adenocarcinoma patients. Therefore, the long-chain non-coding RNA LINC00842 can be used as a judgment standard for lung adenocarcinoma prognosis, can be used as a biomarker for preparing a lung adenocarcinoma patient prognosis preparation, and further can provide a lung adenocarcinoma prognosis prediction kit which has high cost performance and is easy to popularize and apply.
The lung adenocarcinoma prognosis detection kit comprises a long-chain non-coding RNA LINC00842 real-time fluorescence quantitative PCR specific primer: a forward primer: 5'-CTGCCCAGTTAAGGCACAACTCTC-3' (SEQ ID NO. 2); reverse primer: 5'-AGCGCTGCGGAGAGGCAGTCT-3' (SEQ ID NO. 3).
Preferably, the kit further comprises GAPDH internal reference real-time fluorescence quantitative PCR specific primers: a forward primer: 5'-GTGGATATTGTTGCCATCAATGAC-3' (SEQ ID NO. 4); reverse primer: 5'-GACGGTGCCATGGAATTTGCCATG-3' (SEQ ID NO. 5).
The detection method for using the long-chain non-coding RNA LINC00842 for the prognosis of the lung adenocarcinoma patient is as follows: (1) collecting lung adenocarcinoma tissues excised after the operation of an individual to be detected, and extracting total RNA; (2) reverse transcribing the long-chain non-coding RNA LINC00842 into cDNA by taking the total RNA as a template; (3) carrying out real-time fluorescent quantitative PCR amplification by using a long-chain non-coding RNA LINC00842 specific primer to obtain a relative expression quantity of 2ΔΔCTWhen 2 is presentΔΔCT<A time of 0.10 suggests that the long-chain non-coding RNA LINC00842 has low expression.
In conclusion, the detection preparation can be used for detecting the expression level of the long-chain non-coding RNA LINC00842 in a lung adenocarcinoma patient, provides a powerful molecular biological basis for prognosis prediction of the lung adenocarcinoma patient, and has profound clinical significance and popularization.
Drawings
FIG. 1 shows that real-time fluorescence quantitative PCR analysis is performed on the expression difference of a long-chain non-coding RNA LINC00842 in lung adenocarcinoma tissues and normal lung tissues;
FIG. 2 is a graph of the relationship between the long non-coding RNA LINC00842 and the prognosis of 35 patients with lung adenocarcinoma.
Detailed Description
Example 1 preparation of Long non-coding RNA LINC00842 for prognostic test kit for lung adenocarcinoma (50 reactions)
50ml RNA stabilizing solution
2. Isopropanol 100ml
3. Chloroform 100ml
4.Trizol 50ml
5. 10ml of enzyme-free water
6.1 uM random reverse transcription primer 50ul
7.5 Xreverse transcription buffer 200ml
8.10 mM deoxynucleotide triphosphate base 100ul
9.40U/. mu.l RNase inhibitor 500ul
10.200U/. mu.l MMLV reverse transcriptase 50ul
11. Premix Ex Taq 50ul
12.10. mu.M long-chain non-coding RNA LINC00842 real-time fluorescent quantitative PCR specific primer:
forward primer 5'-CTGCCCAGTTAAGGCACAACTCTC-3' (SEQ ID NO.2),
reverse primer 5'-AGCGCTGCGGAGAGGCAGTCT-3' (SEQ ID NO.3),
13.10 μ M internal reference GAPDH real-time fluorescent quantitative PCR specific primers:
the forward primer was 5'-GTGGATATTGTTGCCATCAATGAC-3' (SEQ ID NO.4),
the reverse primer was 5'-GACGGTGCCATGGAATTTGCCATG-3' (SEQ ID NO. 5).
Example 2 Long-chain non-coding RNA LINC00842 detection in Lung adenocarcinoma tissue
1. Preservation of lung adenocarcinoma tissue: collecting lung adenocarcinoma tissue to be detected, storing the lung adenocarcinoma tissue in a freezing tube filled with RNA stable solution, and placing the lung adenocarcinoma tissue in a refrigerator at the temperature of minus 80 ℃ for later use.
2. Extraction of RNA from tissues: taking a proper amount of specimen, adding liquid nitrogen into a mortar baked for 6-8h at 180 ℃, grinding the specimen into powder, adding 1ml of Trizol mortar specimen into the mortar, grinding the powder into liquid, transferring the liquid into a centrifuge tube, adding 200 mu l/ml of chloroform into the centrifuge tube, shaking the liquid for 15-30s by hand, standing the liquid on ice for 5min, and centrifuging the liquid for 15min at 12000g at 4 ℃; carefully taking the upper water phase into a new centrifugal tube, adding 0.5ml of precooled isopropanol, uniformly mixing, standing for 20min in a refrigerator at the temperature of-20 ℃, and centrifuging for 10min at the temperature of 4 ℃ at 12000 g; discarding supernatant, adding 1-2ml ethanol diluted with 75% ribozyme-free water, mixing, centrifuging at 4 deg.C for 5min at 7500g, discarding supernatant, drying at room temperature for 5-10min, and adding 10-20 μ l ribozyme-free water to dissolve RNA. The concentration and the quality of RNA are measured by spectrophotometry, the OD260/280 ratio is between 1.8 and 2.0, and the RNA is stored at the temperature of minus 80 ℃.
3. Long non-coding RNA LINC00842 transcription: a reverse transcription kit from Thermo was used. The system for 20. mu.L reverse transcription reaction is shown in Table 1:
TABLE 1
Composition (I) | Dosage/tube |
Random reverse transcription primer (1uM) | 1ul |
RNA samples | 2ug |
Ribozyme-free water | To 12ul |
Reverse transcription first step conditions: 5min at 65 ℃ as in table 2:
TABLE 2
Composition (I) | Dosage/tube |
5 × reverse transcription buffer | 4μl |
Base triphosphate deoxynucleotide (10mM) | 2μl |
RNase inhibitor (40U/. mu.l) | 1μl |
MMLV reverse transcriptase (200U/. mu.l) | 1μl |
Products of the first PCR | 12μg |
Reverse transcription second step procedure: 5 minutes at 25 ℃, 60 minutes at 42 ℃ and 5 minutes at 70 ℃.
4. Carrying out real-time quantitative PCR by using a long-chain non-coding RNA LINC00842 specific primer: the specific primer sequence of the long-chain non-coding RNA LINC00842 is synthesized by Shanghai biological engineering Co.
The transcription product is diluted 5 times and mixed evenly. 20 μ L reaction system as in Table 3:
TABLE 3
Real-time fluorescent quantitative PCR reaction program: 95 ℃ for 3 minutes, 40 cycles, 95 ℃ for 10 seconds, 60 ℃ for 30 seconds.
The sequence of the long-chain non-coding RNA LINC00842 specific primer is as follows:
forward primer 5'-CTGCCCAGTTAAGGCACAACTCTC-3' (SEQ ID NO.2),
reverse primer 5'-AGCGCTGCGGAGAGGCAGTCT-3' (SEQ ID NO.3),
5、-2ΔΔCTmeasurement of the index: the experimental data were analyzed by a relatively quantitative analysis method using GAPDH as an internal reference gene and using GraphPad Prism software. Analysis shows that compared with the expression in the normal lung tissue of the long-chain non-coding RNA LINC00842, the expression of the long-chain non-coding RNA LINC00842 in 35 lung adenocarcinoma patients is obviously reduced and has significant difference (P)<0.0001)。
6. Prognosis determination
Through the follow-up of 35 patients with lung adenocarcinoma or family members adopted in the experiment, the time of first onset, treatment condition, recurrence condition, death time and the like of the patients are inquired in detail, and the follow-up time is 1-60 months. And selecting an expression value of fluorescent quantitative PCR analysis as a reference standard from selected lung adenocarcinoma patients, wherein the expression value of the obtained results which is higher than the median after descending order arrangement is high-expression of the long-chain non-coding RNA LINC00842 in 18 cases, and the expression values of the other results are low-expression of the long-chain non-coding RNA LINC00842 in 17 cases. Through Kaplan-Meier survival analysis, the survival time of the long-chain non-coding RNA LINC00842 low-expression patient is shorter than that of the long-chain non-coding RNA LINC00842 high-expression patient, and the prognosis is poor. The difference was statistically significant (P ═ 0.0467). Ratio risk model prognostic analysis finds that the risk rate of the long-chain non-coding RNA LINC00842 is greater than 1(HR is 2.7160), which indicates that the prognosis of the patient with high expression prognosis of the patient with low expression of the long-chain non-coding RNA LINC00842 is poor, and the low expression of the long-chain non-coding RNA LINC00842 is an independent risk factor for predicting the risk of the lung adenocarcinoma patient with prognosis.
The research also shows that the long-chain non-coding RNA LINC00842 can be used as a specific molecular marker for lung adenocarcinoma patient prognosis.
SEQUENCE LISTING
<110> Hunan ya Hospital MaoChao of the university of China
<120> Long non-coding RNA
Application of LINC00842 as biomarker in preparation of lung adenocarcinoma prognosis detection preparation
<160> 5
<170> PatentIn version 3.5
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<211> 2877
<212> DNA
<213> Artificial Synthesis
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gtctgttctg gctgctgtga caaaatgcct taagctgggt ggcttataaa ccacagaaat 1320
ttatttctca ctgttctgga ggctgggaag tcctacagac tggggtactg gcctgcttgt 1380
ttcctcgtga gggctctctt cctgggttgc agatggacat ctccctgatg tatcttcaca 1440
tggcagagag agagagagag agagagacag aaagacagag aaagagagag agagagagag 1500
agagcatgct ctttggtctc ttctggtaag ggcctaatcc cgtcatgaag aatccccata 1560
acttcaacta aatctaatca cttctcaaag gctccatctc cacataccat cccattgtgg 1620
gttagggttt caacatagga attctggagg cacacaaacg tgcagttcaa aacatgtgga 1680
gacaaggggg caaggactag agagccctac catcctcgtt caaacccttg aatcaagcct 1740
gaagtcaaag aacttccttt ggagagcccc attccatgag ccgataattt ccccattttg 1800
ccatcaccca cttgagtttg ggattttccc ccagttactg agtgcctgac tgacatgatg 1860
ccccccacag atgggcctcc ctgcccccaa tctcacctcc tctgttagtt tcctggggtt 1920
gccacaacaa agcgttacag gcagagcggc taaaacgaca gaaacttatg gtctcacagt 1980
tctggaggct gcaagttcaa ggtcaaggtg tcagcagggt tggttccttc ggaaggctgt 2040
gcaggagcct gttgggtgcc tgtccctcag cttctagtgg attacttcca tcttcagcat 2100
gccttggctt gtagaaggac taccctgaac tctgccttca tggtcacaac acatcctccc 2160
tgtgtgtgtt tctgtgtcca aatttcccct tcttataagg acaccagtct tatacggaca 2220
atgctcaatg tatgaacctt tgccaaggga ttggattagg gacccactat attccagtat 2280
gacctcatct taactaatta tacctgcaat gacactgctt ccaaagaagg ccacatgatg 2340
aggtaccgtt ggttaggaat tcaatatatg agtttggggg gacacagttc agcccacacc 2400
acctcctctg accctgaatt ggatgctgtt tctgctctgc ttatgatcct cttgtcctca 2460
ctggcctctt ggtccagcac ccactgaggc accagctctg agagagctca ctggcttcac 2520
acaggtgcga cctgatggcg cctcacctca caccccaaac atccttctca tctctgcagg 2580
acctgctctg tttatgtcca ggtatgttca gtgttcctgt gtgtccccag agtgtgggga 2640
ggtaatgctc catgtacgaa cctttgccaa gggaatatgg aaaccgatgg atgagttctt 2700
acctcttttt tcgtccagac aaactgtcct aagatggttt taagagatac cgagtaatca 2760
gctgccagct cagtagcgca tcttcagatt gactctccct ccttccctgt ctccttcccc 2820
atattcttca tcttgttccc tgggatcttt ctccctaata aaggaaaagc tcataga 2877
<210> 2
<211> 24
<212> DNA
<213> Artificial Synthesis
<400> 2
ctgcccagtt aaggcacaac tctc 24
<210> 3
<211> 21
<212> DNA
<213> Artificial Synthesis
<400> 3
agcgctgcgg agaggcagtc t 21
<210> 4
<211> 24
<212> DNA
<213> Artificial Synthesis
<400> 4
gtggatattg ttgccatcaa tgac 24
<210> 5
<211> 24
<212> DNA
<213> Artificial Synthesis
<400> 5
gacggtgcca tggaatttgc catg 24
Claims (2)
1. Application of long-chain non-coding RNA LINC00842 in preparation of lung adenocarcinoma prognosis detection preparation.
2. The application of the long-chain non-coding RNA LINC00842 in preparing a lung adenocarcinoma prognosis detection kit.
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CN110358834B (en) * | 2019-07-12 | 2023-05-16 | 深圳大学 | Application of lncRNA, kit and medicine |
CN110747273B (en) * | 2019-11-12 | 2023-04-07 | 中南大学 | Application of long-chain non-coding RNA LINC00263 in preparation of drug resistance detection preparation for breast cancer |
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